[source] odhcp6c: add ra_holdoff config option and update to git HEAD version (FS#964)

[LEDE Commits]

dedeckeh pushed a commit to source.git, branch master:
https://git.lede-project.org/05c3647d35bb6fe762b221f36f68d44cce15b963

commit 05c3647d35bb6fe762b221f36f68d44cce15b963
Author: Hans Dedecker <dedeckeh at gmail.com>
AuthorDate: Sat Sep 2 22:05:01 2017 +0200

    odhcp6c: add ra_holdoff config option and update to git HEAD version (FS#964)
    
    51733a6 ra: align RA update interval with RFC4861 (FS#964)
    
    Add ra_holdoff config option which allows to configure the RA minimum
    update interval which is by default 3 seconds as stated in RFC4861.
    
    Signed-off-by: Hans Dedecker <dedeckeh at gmail.com>
---
 package/network/ipv6/odhcp6c/Makefile        | 8 ++++----
 package/network/ipv6/odhcp6c/files/dhcpv6.sh | 7 +++++--
 2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/package/network/ipv6/odhcp6c/Makefile b/package/network/ipv6/odhcp6c/Makefile
index 6671e01..a95a380 100644
--- a/package/network/ipv6/odhcp6c/Makefile
+++ b/package/network/ipv6/odhcp6c/Makefile
@@ -8,13 +8,13 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=odhcp6c
-PKG_RELEASE:=2
+PKG_RELEASE:=3
 
 PKG_SOURCE_PROTO:=git
 PKG_SOURCE_URL=$(LEDE_GIT)/project/odhcp6c.git
-PKG_SOURCE_DATE:=2017-03-22
-PKG_SOURCE_VERSION:=0463b0571af90fbab2bfc75d3338d6bf503dc0fb
-PKG_MIRROR_HASH:=42c500f6d7839fadcc29cd939ebea1b468be69616af160f9a2b82507bcd39520
+PKG_SOURCE_DATE:=2017-09-02
+PKG_SOURCE_VERSION:=51733a6d3bfe0fb9e8c53aea22231e5b8a1f64c3
+PKG_MIRROR_HASH:=7ab8d3755c588b493792110d871c682cdd8e944ae21db64177321c464c104fb3
 PKG_MAINTAINER:=Hans Dedecker <dedeckeh at gmail.com>
 PKG_LICENSE:=GPL-2.0
 
diff --git a/package/network/ipv6/odhcp6c/files/dhcpv6.sh b/package/network/ipv6/odhcp6c/files/dhcpv6.sh
index 9e3f669..56f7552 100755
--- a/package/network/ipv6/odhcp6c/files/dhcpv6.sh
+++ b/package/network/ipv6/odhcp6c/files/dhcpv6.sh
@@ -31,14 +31,15 @@ proto_dhcpv6_init_config() {
 	proto_config_add_boolean fakeroutes
 	proto_config_add_boolean sourcefilter
 	proto_config_add_boolean keep_ra_dnslifetime
+	proto_config_add_int "ra_holdoff"
 }
 
 proto_dhcpv6_setup() {
 	local config="$1"
 	local iface="$2"
 
-	local reqaddress reqprefix clientid reqopts noslaaconly forceprefix extendprefix norelease ip6prefix iface_dslite iface_map iface_464xlat ifaceid userclass vendorclass delegate zone_dslite zone_map zone_464xlat zone soltimeout fakeroutes sourcefilter keep_ra_dnslifetime
-	json_get_vars reqaddress reqprefix clientid reqopts noslaaconly forceprefix extendprefix norelease ip6prefix iface_dslite iface_map iface_464xlat ifaceid userclass vendorclass delegate zone_dslite zone_map zone_464xlat zone soltimeout fakeroutes sourcefilter keep_ra_dnslifetime
+	local reqaddress reqprefix clientid reqopts noslaaconly forceprefix extendprefix norelease ip6prefix iface_dslite iface_map iface_464xlat ifaceid userclass vendorclass delegate zone_dslite zone_map zone_464xlat zone soltimeout fakeroutes sourcefilter keep_ra_dnslifetime ra_holdoff
+	json_get_vars reqaddress reqprefix clientid reqopts noslaaconly forceprefix extendprefix norelease ip6prefix iface_dslite iface_map iface_464xlat ifaceid userclass vendorclass delegate zone_dslite zone_map zone_464xlat zone soltimeout fakeroutes sourcefilter keep_ra_dnslifetime ra_holdoff
 
 
 	# Configure
@@ -64,6 +65,8 @@ proto_dhcpv6_setup() {
 
 	[ "$keep_ra_dnslifetime" = "1" ] && append opts "-L"
 
+	[ -n "$ra_holdoff" ] && append opts "-m$ra_holdoff"
+
 	for opt in $reqopts; do
 		append opts "-r$opt"
 	done